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		<title>three.js geometry - csg</title>
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			body {
				background-color: #eeeeee;
				color: #333;
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			a {
				color: #009688;
				text-decoration: underline;
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	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> bvh csg - <a href="https://github.com/gkjohnson/three-bvh-csg" target="_blank" rel="noopener">three-bvh-csg</a><br/>
			See <a href="https://github.com/gkjohnson/three-bvh-csg" target="_blank" rel="noopener">main project repository</a> for more information and examples on constructive solid geometry.
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/",
					"three-mesh-bvh": "https://cdn.jsdelivr.net/npm/three-mesh-bvh@0.7.3/build/index.module.js",
					"three-bvh-csg": "https://cdn.jsdelivr.net/npm/three-bvh-csg@0.0.16/build/index.module.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';
			import Stats from 'three/addons/libs/stats.module.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { SUBTRACTION, INTERSECTION, ADDITION, Brush, Evaluator } from 'three-bvh-csg';

			let stats;
			let camera, scene, renderer;
			let baseBrush, brush;
			let core;
			let result, evaluator, wireframe;

			const params = {

				operation: SUBTRACTION,
				useGroups: true,
				wireframe: false,

			};

			init();

			function init() {

				// environment
				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 100 );
				camera.position.set( - 1, 1, 1 ).normalize().multiplyScalar( 10 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xfce4ec );

				// lights
				const ambient = new THREE.HemisphereLight( 0xffffff, 0xbfd4d2, 3 );
				scene.add( ambient );

				const directionalLight = new THREE.DirectionalLight( 0xffffff, 0.3 );
				directionalLight.position.set( 1, 4, 3 ).multiplyScalar( 3 );
				directionalLight.castShadow = true;
				directionalLight.shadow.mapSize.setScalar( 2048 );
				directionalLight.shadow.bias = - 1e-4;
				directionalLight.shadow.normalBias = 1e-4;
				scene.add( directionalLight );

				// renderer
				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFShadowMap;
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				// add shadow plane
				const plane = new THREE.Mesh(
					new THREE.PlaneGeometry(),
					new THREE.ShadowMaterial( {
						color: 0xd81b60,
						transparent: true,
						opacity: 0.075,
						side: THREE.DoubleSide,
					} ),
				);
				plane.position.y = - 3;
				plane.rotation.x = - Math.PI / 2;
				plane.scale.setScalar( 10 );
				plane.receiveShadow = true;
				scene.add( plane );

				// create brushes
				evaluator = new Evaluator();

				baseBrush = new Brush(
					new THREE.IcosahedronGeometry( 2, 3 ),
					new THREE.MeshStandardMaterial( {
						flatShading: true,

						polygonOffset: true,
						polygonOffsetUnits: 1,
						polygonOffsetFactor: 1,
					} ),
				);

				brush = new Brush(
					new THREE.CylinderGeometry( 1, 1, 5, 45 ),
					new THREE.MeshStandardMaterial( {
						color: 0x80cbc4,

						polygonOffset: true,
						polygonOffsetUnits: 1,
						polygonOffsetFactor: 1,

					} ),
				);

				core = new Brush(
					new THREE.IcosahedronGeometry( 0.15, 1 ),
					new THREE.MeshStandardMaterial( {
						flatShading: true,
						color: 0xff9800,
						emissive: 0xff9800,
						emissiveIntensity: 0.35,

						polygonOffset: true,
						polygonOffsetUnits: 1,
						polygonOffsetFactor: 1,

					} ),
				);
				core.castShadow = true;
				scene.add( core );

				// create wireframe
				wireframe = new THREE.Mesh(
					undefined,
					new THREE.MeshBasicMaterial( { color: 0x009688, wireframe: true } ),
				);
				scene.add( wireframe );

				// controls
				const controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 5;
				controls.maxDistance = 75;

				// set up gui
				const gui = new GUI();
				gui.add( params, 'operation', { SUBTRACTION, INTERSECTION, ADDITION } );
				gui.add( params, 'wireframe' );
				gui.add( params, 'useGroups' );

				window.addEventListener( 'resize', onWindowResize );
				onWindowResize();

			}

			function updateCSG() {

				evaluator.useGroups = params.useGroups;
				result = evaluator.evaluate( baseBrush, brush, params.operation, result );

				result.castShadow = true;
				result.receiveShadow = true;
				scene.add( result );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				// update the transforms
				const t = window.performance.now() + 9000;
				baseBrush.rotation.x = t * 0.0001;
				baseBrush.rotation.y = t * 0.00025;
				baseBrush.rotation.z = t * 0.0005;
				baseBrush.updateMatrixWorld();

				brush.rotation.x = t * - 0.0002;
				brush.rotation.y = t * - 0.0005;
				brush.rotation.z = t * - 0.001;

				const s = 0.5 + 0.5 * ( 1 + Math.sin( t * 0.001 ) );
				brush.scale.set( s, 1, s );
				brush.updateMatrixWorld();

				// update the csg
				updateCSG();

				wireframe.geometry = result.geometry;
				wireframe.visible = params.wireframe;

				renderer.render( scene, camera );
				stats.update();

			}

		</script>

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